iPhone 开发过程中的一些小技术的总结
1 随机数的使用
- 头文件的引用
- #import <time.h>
- #import <mach/mach_time.h>
- srandom()的使用
- srandom((unsigned)(mach_absolute_time() & 0xFFFFFFFF));
- 直接使用 random() 来调用随机数
2 在UIImageView 中旋转图像
- float rotateAngle = M_PI;
- CGAffineTransform transform =CGAffineTransformMakeRotation(rotateAngle);
- imageView.transform = transform;
以上代码旋转imageView, 角度为rotateAngle, 方向可以自己测试哦!
3 在Quartz中如何设置旋转点
- UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"bg.png"]];
- imageView.layer.anchorPoint = CGPointMake(0.5, 1.0);
这个是把旋转点设置为底部中间。记住是在QuartzCore.framework中才得到支持。
4 创建.plist文件并存储
- NSString *errorDesc; //用来存放错误信息
- NSMutableDictionary *rootObj = [NSMutableDictionary dictionaryWithCapacity:4]; //NSDictionary, NSData等文件可以直接转化为plist文件
- NSDictionary *innerDict;
- NSString *name;
- Player *player;
- NSInteger saveIndex;
-
- for(int i = 0; i < [playerArray count]; i++) {
- player = nil;
- player = [playerArray objectAtIndex:i];
- if(player == nil)
- break;
- name = player.playerName;// This "Player1" denotes the player name could also be the computer name
- innerDict = [self getAllNodeInfoToDictionary:player];
- [rootObj setObject:innerDict forKey:name]; // This "Player1" denotes the person who start this game
- }
- player = nil;
- NSData *plistData = [NSPropertyListSerialization dataFromPropertyList:(id)rootObj format:NSPropertyListXMLFormat_v1_0 errorDescription:&errorDesc];
红色部分可以忽略,只是给rootObj添加一点内容。这个plistData为创建好的plist文件,用其writeToFile方法就可以写成文件。下面是代码:
- /*得到移动设备上的文件存放位置*/
- NSString *documentsPath = [self getDocumentsDirectory];
- NSString *savePath = [documentsPath stringByAppendingPathComponent:@"save.plist"];
-
- /*存文件*/
- if (plistData) {
- [plistData writeToFile:savePath atomically:YES];
- }
- else {
- NSLog(errorDesc);
- [errorDesc release];
- }
- - (NSString *)getDocumentsDirectory {
- NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
- return [paths objectAtIndex:0];
- }
5 读取plist文件并转化为NSDictionary
- NSString *documentsPath = [self getDocumentsDirectory];
- NSString *fullPath = [documentsPath stringByAppendingPathComponent:@"save.plist"];
- NSMutableDictionary* plistDict = [[NSMutableDictionary alloc] initWithContentsOfFile:fullPath];
6 读取一般性文档文件
- NSString *tmp;
- NSArray *lines; /*将文件转化为一行一行的*/
- lines = [[NSString stringWithContentsOfFile:@"testFileReadLines.txt"]
- componentsSeparatedByString:@"\n"];
-
- NSEnumerator *nse = [lines objectEnumerator];
7 隐藏NavigationBar
- [self.navigationController setNavigationBarHidden:YES animated:YES];
在想隐藏的ViewController中使用就可以了。
- // 读取<>里的内容
- while(tmp = [nse nextObject]) {
- NSString *stringBetweenBrackets = nil;
- NSScanner *scanner = [NSScanner scannerWithString:tmp];
- [scanner scanUpToString:@"<" intoString:nil];
- [scanner scanString:@"<" intoString:nil];
- [scanner scanUpToString:@">" intoString:&stringBetweenBrackets];
- NSLog([stringBetweenBrackets description]);
- }
对于读写文件,还有补充,暂时到此。随机数和文件读写在游戏开发中经常用到。所以把部分内容放在这,以便和大家分享,也当记录,便于查找。
Tags: UINavigationController iPhone object-c navigation viewcontroller
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